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Eliminate the temptation to spend more
Warehouse clubs are filled with temptation, and it can be easy to lose all self-control once you step through the doors. In order to make sure you really are buying only the items you need, be sure to make a list beforehand and then stick to it.
Shopping with a smaller cart, as opposed to a bigger one, is also a sneaky way to make sure you don't go overboard with the shopping. Also, avoid the food samples that warehouse clubs are famous for! After you take a bite, you'll want to buy the entire box or bag. Shopping at a warehouse club is meant to save your budget, not break it.